Question

Care este produsul a ori b ori c ,stiindc ca:
a+b=21
b+c=5
a+c=22

Answer 1

a + b = 21
b + c = 5
a + c = 22
2a + 2b + 2c = 21 + 5 + 22 
a + b + c = 48 : 2
a + b + c = 24
21 + c = 24
c = 3

b + c = 5
b + 3 = 5
b = 2

a + b = 21
a + 2 = 21
a = 19

A X B X C = ?
19 X 2 X 3 = 114

Answer 2

a+b=21
b+c=5
a+c=22
2a+2b+2c=48
2(a+b+c)=48
a+b+c=48:2=24
a+b=21
c=24-21=3
b+c=5
b+3=5
b=5-3=2
a+c=22
a+3=22
a=22-3=19
19+2+3=24

19x2x3=38x3=114